Malik Murphy's public defenders requested a second opinion Friday after a state psychologist said the 20-year-old appears mentally fit to stand trial in the stabbing deaths of his two young siblings. The move - granted by presiding 4th Judicial District Judge G. David Miller - comes as Murphy's prosecution hangs in limbo over whether he understands court proceedings. Murphy is charged with first-degree murder and attempted murder in the October stabbings of Noah, 7, and Sophia, 5, as they slept. Investigators say Murphy turned the hunting knife on his father as Sophia screamed for help. Murphy later told detectives he "can't stop thinking about killing people. Read more on Colorado Springs Gazette